irq: Support sleeping when mcu is idle

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
2017-07-12 22:16:16 -04:00
parent 969485c754
commit 118fd21cb8
13 changed files with 101 additions and 10 deletions
--- a/src/generic/armcm_irq.c
+++ b/src/generic/armcm_irq.c
@@ -34,6 +34,12 @@ irq_restore(irqstatus_t flag)
    asm volatile("msr primask, %0" :: "r" (flag) : "memory");
 }

+void
+irq_wait(void)
+{
+    asm volatile("cpsie i\n    wfi\n    cpsid i\n" ::: "memory");
+}
+
 void
 irq_poll(void)
 {